<template>
  <!-- 左侧二级菜单栏的组件封装 -->
  <div class="sidebar">
    <el-menu
      class="sidebar-el-menu"
      :default-active="toIndex"
      background-color="transparent"

      router
    >
      <el-menu-item
        v-for="(item, index) in itemList"
        :key="index"
        :index="item.path"
      >
        <!-- 需要图标的在 item 对象中加上属性 icon -->
        <i :class="item.icon"></i>
        <span slot="title">{{ item.title }}</span>
      </el-menu-item>
    </el-menu>
  </div>
</template>
   
  <script>
export default {
  props: {
    itemList: {
      type: Array,
      default: () => [],
    },
  },
  data() {
    return {};
  },
  computed: {
    toIndex() {
      // 根据路径绑定到对应的二级菜单，防止页面刷新重新跳回第一个
      return this.$route.path.split("/")[2];
    },
  },
  methods: {},
};
</script>
   
  <style lang="scss" scoped>
/* 左侧菜单栏定位和位置大小设定 */
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 70px;
  bottom: 0;
  overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
  width: 0;
}
.sidebar-el-menu {
  width: 250px;
}
.sidebar > ul {
  height: 100%;
}

/* 左侧二级菜单项的样式 */
.el-menu-item {
  font-size: 14px !important;
  padding-left: 35px !important;
}

/* 左侧二级菜单选中时的样式 */
.el-menu-item.is-active {
//   color: #000000 !important;
//   background: #3989fa !important;
}
.el-menu-item,
.el-submenu__title {
  height: 50px !important;
  line-height: 50px !important;
}
</style>